I have this same problem myself and it came out of left field. Surpringsingly it seems to affect only one ear.
I did the whole nine yards and nothing really worked. I wound up have hearing aids.
Wish I could be more positive but I know from personal experience. It affects all age groups. No one seems to know what causes it.
The only way to regain hearing in the affected ear would be a cochlear implant.
Sudden hearing loss typically occurs in one ear. This is consistent with the viral theory of causation. It is a problem affecting the inner ear, which is a sealed space. There is no connection between your left and right inner ears. A sneaky virus might somehow manage to get into one, but it has no pathway to the other. My doc did caution me against touching one ear and then the other — for example, don’t use the same Q tip in both ears. Chances are that contact with the outer ear won’t lead to an infection of the inner ear, but still, there’s no reason to give an opportunistic virus a free ride to the right zip code. Keep ‘em separate.